Not sure if this would be feasible in your case, but when we get mosquito bites, we take an aspirin or two (uncoated), crush it into a powder, and then add just enough water to make a small pasted. Stick this to the bite and it immediately takes the pain and itch away. Also seems to keep it from itching later.
2012 Ford F250 Super Duty, SC 4x4 XLT, 6.2L, 3.73 gears
2011 Keystone Sprinter Select 29BH
Fire ants seem to wait until there are several on you and then they all bite at once. We had many encounters while living down near the coast. The fresh cut onion technique worked for us to get you through the first couple of hours. Some good ideas posted here to try, hope I never need to again. You do want to monitor for allergic reaction with the multiple bites. This can happen to people who never had a reaction in the past.
The aloe vera sprays with lidocaine are very effective on bites. The lidocaine numbs the area just enough to calm the itching down.
A trick I've found for mosquito bites is to rub the area very hard for a few minutes without breaking the skin and then leave it alone. A few hours later a small fluid filled bump will form on top of the bite. Drain it and most of the chemicals that cause the itch will be removed.